Mobile device and optical imaging lens thereof

ABSTRACT

Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises five lens elements positioned in an order from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements to allow the thickness of the second lens element and the sum of all air gaps between all five lens elements along the optical axis satisfying the relation: 0.20&lt;T2&lt;0.50 (mm) and 0.27&lt;(T2/G aa )&lt;0.40, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.

CROSS-REFERENCES TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.13/617,231, filed on Sep. 14, 2012, entitled “Mobile Device and OpticalImaging Lens Thereof” which claims priority from Taiwan PatentApplication No. 101111443, filed on Mar. 30, 2012, the disclosures ofwhich are hereby incorporated by reference in their entirety for allpurposes.

TECHNICAL FIELD

The present invention relates to a mobile device and an optical imaginglens thereof, and particularly, relates to a mobile device applying anoptical imaging lens having five lens elements and an optical imaginglens thereof.

BACKGROUND OF THE INVENTION

The ever-increasing demand for smaller sized mobile devices, such ascell phones, digital cameras, etc. has correspondingly triggered agrowing need for smaller sized photography modules contained therein.Size reductions may be contributed from various aspects of the mobiledevices, which includes not only the charge coupled device (CCD) and thecomplementary metal-oxide semiconductor (CMOS), but also the opticalimaging lens mounted therein. When reducing the size of the opticalimaging lens, however, achieveing good optical characteristics becomes achallenging problem.

US Patent Publication No. 20100253829, US Patent Publication No.2011013069, US Patent Publication No. 20110249346, US Patent PublicationNo. 20100254029, U.S. Pat. No. 7,826,151, U.S. Pat. No. 7,864,454, U.S.Pat. No. 7,911,711, U.S. Pat. No. 8,072,695, Taiwan Patent No. M368072,Taiwan Patent No. M369460 and Taiwan Patent No. M369459 all disclosed anoptical imaging lens constructed with an optical imaging lens havingfive lens elements. Those disclosed optical imaging lenses involved useof a shortened length of the optical imaging lens; however, some oflengths of the optical imaging lens remained too long. For example, inthe first embodiment of Taiwan Patent No. M368072, the length of theoptical imaging lens is around 5.61 mm, which is not beneficial for thesmaller design of mobile devices.

How to effectively shorten the lengths of the optical imaging lens isone of the most important topics in the industry to peruse the trend ofsmaller and smaller mobile devices. Each of the aforesaid patentdocuments faces the limitation of the size of the mobile device due tothe problem of reducing length of the optical imaging lens. Therefore,there is needed to develop optical imaging lens with shorter lengths,while also having good optical characters.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a mobile device and anoptical imaging lens thereof. With controlling the convex or concaveshape of the surfaces of the lens elements, the central thickness alongthe optical axis, and the air gap between two lens elements, etc., thelengths of the optical imaging lens is shortened and meanwhile the goodoptical characters, such as high resolution and the system performance,are sustained.

In an exemplary embodiment, an optical imaging lens comprises, in orderfrom an object side to an image side, a first lens element, a secondlens element, a third lens element, a fourth lens element, and a fifthlens element. The first lens element has positive refractive power andcomprises a convex object-side curved surface. The second lens elementhas negative refractive power and comprises a concave image-side curvedsurface. The third lens element comprises an object-side curved surfaceand an image-side curved surface, and the object-side curved surfacecomprises a concave portion in a vicinity of a periphery of said thirdlens element and the image-side curved surface comprises a convexportion in a vicinity of a periphery of the third lens element. Thefourth lens element comprises a convex image-side curved surface and thefifth lens element comprises an object-side curved surface and animage-side curved surface, wherein the object-side curved surfacecomprises a convex portion in a vicinity of the optical axis and theimage-side curved surface comprises a concave portion in a vicinity ofthe optical axis. Lens as a whole has only the five lens elements withrefractive power, wherein a central thickness of the second lens elementalong the optical axis is T2, a sum of all air gaps from the first lenselement to the fifth lens element along the optical axis is Gaa, andthey satisfy the relation:0.20<T2<0.50 (mm); and0.27<(T2/Gaa)<0.40.

In another exemplary embodiment, other central thickness of lens elementalong the optical axis and/or other ratio of the central thickness oflens element along the optical axis to the sum of all air gaps could befurther controlled, and an example among them is controlling therelation of a central thickness of the third lens element along theoptical axis, T3, and the sum of all air gaps from the first lenselement to the fifth lens element along the optical axis, Gaa, tosatisfy the relation:0.30<(T3/Gaa)<0.45.

Another example embodiment comprises controlling T3 to further satisfythe relation:0.20<T3<0.60 (mm).

Yet, another example embodiment comprises controlling T2 and Gaa tofurther satisfy the relation:0.21<T2<0.47 (mm); and0.28<(T2/Gaa)<0.40.

Yet, another example embodiment comprises controlling T3 and Gaa tofurther satisfy the relation:0.25<T3<0.57 (mm); and0.31<(T3/Gaa)<0.45.

Aforesaid exemplary embodiments are not limited and could be selectivelyincorporated in other embodiments described herein.

Lens elements in example embodiments, such as the aforesaid first lenselement, second lens element, third lens element, fourth lens element,and fifth lens element, are preferable made by plastic lens element withinjection molding. Therefore, the technical barrier and the cost may beaffected by the thickness of lens element. For example, if the centralthickness of the second lens element along the optical axis, T2, is lessthan the lower limit, 0.2 (mm), the center of the second lens elementmay be too thin and cause melting plastic material to fail to pass themold, and compared with currently technical level, the difficulty andcost for production in such situations are too high. Therefore, thelower limits of the above ranges of T2 and T3 are determined based oncurrently technical level. Further, the thicknesses of the first lenselement, the second lens element, the third lens element, the fourthlens element, and fifth lens element affect the length of the opticalimaging lens. For example, if the central thickness of the second lenselement along the optical axis, T2, exceeds the upper limit, 0.5 (mm),the second lens element may be too thick and cause the length of theoptical imaging lens to be too long and fail to match the request ofsmaller optical imaging lens. Therefore, the upper limits of aboveranges of T2 and T3 are determined based on the preferable length of theoptical imaging lens.

In example embodiments, an aperture stop is provided for adjusting theinput of light of the system. For example, the aperture stop isselectively provided but not limited to be positioned at the object sideof the first lens element, or positioned between the first lens elementand the second lens element.

In some exemplary embodiments, more details about the convex or concavesurface structure and/or the refractive power could be incorporated forone specific lens element or broadly for plural lens elements to enhancethe control for the system performance and/or resolution. For example,for the second lens element, an object-side curved surface is comprised,but the object-side curved surface need not be limited to a convexportion in a vicinity of a periphery of the second lens element. Anexample for illustrating the details broadly for plural lens elementscomprises the first lens element having positive refractive power andcomprising a convex object-side curved surface; the second lens elementhaving negative refractive power and comprising an object-side curvedsurface and a concave image-side curved surface; the third lens elementcomprising an object-side curved surface and an image-side curvedsurface, wherein the object-side curved surface comprises a convexportion in a vicinity of the optical axis and a concave portion in avicinity of a periphery of the third lens element, and the image-sidecurved surface comprises a concave portion in a vicinity of the opticalaxis and a convex portion in a vicinity of a periphery of the third lenselement; the fourth lens element having positive refractive power andcomprising a concave object-side curved surface and a convex image-sidecurved surface; and the fifth lens element having negative refractivepower and comprising an object-side curved surface and an image-sidecurved surface, wherein the object-side curved surface comprises aconvex portion in a vicinity of the optical axis and a convex portion ina vicinity of a periphery of the fourth lens element, and the image-sidecurved surface comprises a concave portion in a vicinity of the opticalaxis and a convex portion in a vicinity of a periphery of the fourthlens element. Another example for illustrating the details broadly forplural lens elements comprises the first lens element having positiverefractive power and comprising a convex object-side curved surface anda concave image-side curved surface; the second lens element havingnegative refractive power and comprising an object-side curved surfaceand a concave image-side curved surface, wherein the object-side curvedsurface of the second lens element comprises a convex portion in avicinity of the optical axis and a convex portion in a vicinity of aperiphery of the second lens element; the third lens element comprisingan object-side curved surface and an image-side curved surface, whereinthe object-side curved surface comprises a concave portion in a vicinityof the optical axis and a concave portion in a vicinity of a peripheryof the third lens element, and the image-side curved surface comprises aconvex portion in a vicinity of a periphery of the third lens element;the fourth lens element having positive refractive power and comprisinga concave object-side curved surface and a convex image-side curvedsurface; and the fifth lens element having negative refractive power andcomprising an object-side curved surface and an image-side curvedsurface, wherein the object-side curved surface comprises a convexportion in a vicinity of the optical axis and a convex portion in avicinity of a periphery of the fifth lens element, and the image-sidecurved surface comprises a concave portion in a vicinity of the opticalaxis and a convex portion in a vicinity of a periphery of the fifth lenselement. Exemplary embodiments for incorporating details broadly forplural lens elements are not limited to the above examples.

Further, exemplary embodiments could provide more details about thestructure, the refractive power, and/or the aperture stop position for aspecific lens element or broadly for plural lens elements to fitvariable requests. For example, based on the aforesaid examples, anexample embodiment comprises the first lens element comprising a conveximage-side curved surface, wherein the object-side curved surface of thesecond lens element comprises a concave portion in a vicinity of theoptical axis and a concave portion in a vicinity of a periphery of thesecond lens element, the third lens element having positive refractivepower, and an aperture stop provided at the object side of the firstlens element. Another example embodiment is provided with the first lenselement comprising a convex image-side curved surface, wherein theobject-side curved surface of the second lens element comprises a convexportion in a vicinity of the optical axis and a convex portion in avicinity of a periphery of the second lens element, the third lenselement having negative refractive power, and an aperture stop providedat the object side of the first lens element. Another example embodimentis provided with the first lens element comprising a concave image-sidecurved surface, the object-side curved surface of the second lenselement comprising a convex portion in a vicinity of the optical axisand a convex portion in a vicinity of a periphery of the second lenselement, the third lens element having positive refractive power, and anaperture stop provided between the first lens element and the secondlens element. Another example embodiment is provided with the first lenselement comprising a concave image-side curved surface, the object-sidecurved surface of the second lens element comprises a convex portion ina vicinity of the optical axis and a concave portion in a vicinity of aperiphery of the second lens element, the third lens element havingpositive refractive power, and an aperture stop provided at the objectside of the first lens element. Similarly, based on the later of theaforesaid examples, more examples could be obtained with the furtherdetails listed below, including an example embodiment is provided withthe third lens element having positive refractive power, and the thirdlens element the image-side curved surface comprising a convex portionin a vicinity of the optical axis. Another example embodiment isprovided with the third lens element having negative refractive power,and the image-side curved surface of the third lens element comprising aconcave portion in a vicinity of the optical axis. Another exampleembodiment is provided with the third lens element having negativerefractive power, and the image-side curved surface of the third lenselement comprising a convex portion in a vicinity of the optical axis.It is noted that the examples above may be incorporated into otherembodiments if no inconsistencies arise.

In another exemplary embodiment, a mobile device comprises a housing andan optical imaging lens assembly positioned in the housing. The opticalimaging lens assembly comprises a lens barrel, any of aforesaid exampleembodiments of optical imaging lens, a module housing unit, and an imagesensor. The lens comprising five lens elements with refractive power asa whole is positioned in the lens barrel, the module housing unit is forpositioning the optical imaging lens, and the image sensor is positionedat the image-side of the optical imaging lens.

In exemplary embodiments, the module housing unit comprises, but is notlimited to, an image sensor base and an auto focus module, wherein theimage sensor base is for fixing the image sensor, and the auto focusmodule comprises a lens seat for positioning the optical imaging lens tocontrol the focusing of the optical imaging lens.

Through controlling the ratio of at least one central thickness of lenselement along the optical axis to a sum of all air gaps between the fivelens elements along the optical axis in a predetermined range, andincorporated with the arrangement of the convex or concave shape of thesurfaces of the lens element(s) and/or refraction power, the mobiledevice and the optical imaging lens thereof in exemplary embodimentsachieve good optical characters and effectively shorten the lengths ofthe optical imaging lens.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appended drawing,in which:

FIG. 1 shows a cross-sectional view of an optical imaging lens havingfive lens elements of the optical imaging lens according to an exampleembodiment;

FIG. 2 shows another cross-sectional view of a lens element of theoptical imaging lens according to an example embodiment;

FIG. 3 shows a table of optical data of each lens element of the opticalimaging lens according to an example embodiment;

FIG. 4 shows a table of aspherical data of the optical imaging lensaccording to an example embodiment;

FIG. 5( a) shows the longitudinal spherical aberration, FIGS. 5( b) and5(c) show the respective astigmatic field curves in the sagittal andtangential direction, and FIG. 5( d) shows the distortion of the opticalimaging lens of FIG. 1;

FIG. 6 shows a cross-sectional view of an optical imaging lens havingfive lens elements of the optical imaging lens according to an exampleembodiment;

FIG. 7 shows a table of optical data of each lens element of the opticalimaging lens according to an example embodiment;

FIG. 8 shows a table of aspherical data of the optical imaging lensaccording to an example embodiment;

FIG. 9( a) shows the longitudinal spherical aberration, FIGS. 9( b) and9(c) show the respective astigmatic field curves in the sagittal andtangential direction, and FIG. 9( d) shows the distortion of the opticalimaging lens of FIG. 6;

FIG. 10 shows a cross-sectional view of an optical imaging lens havingfive lens elements of the optical imaging lens according to an exampleembodiment;

FIG. 11 shows a table of optical data of each lens element of theoptical imaging lens according to an example embodiment;

FIG. 12 shows a table of aspherical data of the optical imaging lensaccording to an example embodiment;

FIG. 13( a) shows the longitudinal spherical aberration, FIGS. 13( b)and 13(c) show the respective astigmatic field curves in the sagittaland tangential direction, and FIG. 13( d) shows the distortion of theoptical imaging lens of FIG. 10;

FIG. 14 shows a cross-sectional view of an optical imaging lens havingfive lens elements of the optical imaging lens according to an exampleembodiment;

FIG. 15 shows a table of optical data of each lens element of theoptical imaging lens according to an example embodiment;

FIG. 16 shows a table of aspherical data of the optical imaging lensaccording to an example embodiment;

FIG. 17( a) shows the longitudinal spherical aberration, FIGS. 17( b)and 17(c) show the respective astigmatic field curves in the sagittaland tangential direction, and FIG. 17( d) shows the distortion of theoptical imaging lens of FIG. 14;

FIG. 18 shows a cross-sectional view of an optical imaging lens havingfive lens elements of the optical imaging lens according to an exampleembodiment;

FIG. 19 shows a table of optical data of each lens element of theoptical imaging lens according to an example embodiment;

FIG. 20 shows a table of aspherical data of the optical imaging lensaccording to an example embodiment;

FIG. 21( a) shows the longitudinal spherical aberration, FIGS. 21( b)and 21(c) show the respective astigmatic field curves in the sagittaland tangential direction, and FIG. 21( d) shows the distortion of theoptical imaging lens of FIG. 18;

FIG. 22 shows a cross-sectional view of an optical imaging lens havingfive lens elements of the optical imaging lens according to an exampleembodiment;

FIG. 23 shows a table of optical data of each lens element of theoptical imaging lens according to an example embodiment;

FIG. 24 shows a table of aspherical data of the optical imaging lensaccording to an example embodiment;

FIG. 25( a) shows the longitudinal spherical aberration, FIGS. 25( b)and 25(c) show the respective astigmatic field curves in the sagittaland tangential direction, and FIG. 25( d) shows the distortion of theoptical imaging lens of FIG. 22;

FIG. 26 shows a cross-sectional view of an optical imaging lens havingfive lens elements of the optical imaging lens according to an exampleembodiment;

FIG. 27 shows a table of optical data of each lens element of theoptical imaging lens according to an example embodiment;

FIG. 28 shows a table of aspherical data of the optical imaging lensaccording to the seventh embodiment of the present invention;

FIG. 29( a) shows the longitudinal spherical aberration, FIGS. 29( b)and 29(c) show the respective astigmatic field curves in the sagittaland tangential direction, and FIG. 29( d) shows the distortion of theoptical imaging lens of FIG. 26;

FIG. 30 shows a comparison table for the values of T2, T3, T2/Gaa andT3/Gaa of example embodiments;

FIG. 31 shows a structure of an example embodiment of a mobile device;

FIG. 32 shows an enlarged view of a structure of an example embodimentof a mobile device; and

FIG. 33 shows another enlarged view of a structure of an exampleembodiment of a mobile device.

DETAILED DESCRIPTION OF THE INVENTION

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumbers indicate like features. Persons having ordinary skill in the artwill understand other varieties for implementing example embodiments,including those described herein. The drawings are not limited tospecific scale and similar reference numbers are used for representingsimilar elements. As used in the disclosures and the appended claims,the terms “example embodiment,” “exemplary embodiment,” and “presentembodiment” do not necessarily refer to a single embodiment, although itmay, and various example embodiments may be readily combined andinterchanged, without departing from the scope or spirit of the presentinvention. Furthermore, the terminology as used herein is for thepurpose of describing example embodiments only and is not intended to bea limitation of the invention. In this respect, as used herein, the term“in” may include “in” and “on”, and the terms “a”, “an” and “the” mayinclude singular and plural references. Furthermore, as used herein, theterm “by” may also mean “from”, depending on the context. Furthermore,as used herein, the term “if” may also mean “when” or “upon”, dependingon the context. Furthermore, as used herein, the words “and/or” mayrefer to and encompass any and all possible combinations of one or moreof the associated listed items.

Example embodiments of an optical imaging lens may comprise a first lenselement, a second lens element, a third lens element, a fourth lenselement, and a fifth lens element. These lens elements may be arrangedin an order from an object side to an image side, and exampleembodiments of the lens as a whole may comprise the five lens elementswith refractive power. In an example embodiment: the first lens elementhaving positive refractive power comprises a convex object-side curvedsurface; the second lens element having negative refractive powercomprises a concave image-side curved surface; the third lens elementcomprises an object-side curved surface and an image-side curvedsurface, wherein the object-side curved surface comprises a concaveportion in a vicinity of a periphery of the third lens element and theimage-side curved surface comprises a convex portion in a vicinity of aperiphery of the third lens element; the fourth lens element comprises aconvex image-side curved surface; the fifth lens element comprises anobject-side curved surface and an image-side curved surface, wherein theobject-side curved surface comprises a convex portion in a vicinity ofthe optical axis, the image-side curved surface comprises a concaveportion in a vicinity of the optical axis. The central thickness of thesecond lens element the along the optical axis, T2, and the sum of allair gaps between the first lens element to the fifth lens element alongthe optical axis, Gaa, satisfy the relation as followed:0.20<T2<0.50 (mm)  equation (1);

and0.27<(T2/Gaa)<0.40  equation (2);

and/or0.21<T2<0.47 (mm)  equation (1′);

and0.28<(T2/Gaa)<0.40  equation (2′);

to achieve good optical characters and shortened length of the opticalimaging lens.

In some example embodiments, other thicknesses of lens along the opticalaxis and/or the ratio of which to the sum of all air gaps can be alsocontrolled, and an example is provided with controlling a centralthickness of the third lens element along the optical axis, T3, and/orcontrolling the ratio of T3 to Gaa to satisfy the relation:0.20<T3<0.60 (mm)  equation (3);

and/or0.30<(T3/Gaa)<0.45  equation (4);

and/or0.25<T3<0.57 (mm)  equation (3′);

and/or0.31<(T3/Gaa)<0.45  equation (4′).

Because example embodiments of the lens elements, such as aforesaidfirst lens element, second lens element, third lens element, fourth lenselement, and fifth lens element, is preferable a lens elements made byinjection-molding plastic, the thickness of the lens elements willaffect the technical barrier and cost. For example, if the centralthickness of the second lens element along the optical axis, T2, is lessthan the lower limit, 0.2 (mm), the center of the second lens elementmay be too thin and cause melting plastic material fail to pass themold, and compared with currently technical level, the difficulty andcost for production in such situation are too high. It will beappreciated that the lower limits of above ranges of T2 and T3 aredetermined based on current technical levels. Further, the thicknessesof the first lens element, the second lens element, the third lenselement, the fourth lens element, and fifth lens element affect thelength of the optical imaging lens. For example, if the centralthickness of the second lens element along the optical axis, T2, exceedsthe upper limit, 0.5 (mm), the second lens element will be too thick andcause the length of the optical imaging lens to be too long and fail tomatch the request of a smaller optical imaging lens. Therefore, theupper limits of the above ranges of T2 and T3 are determined based onthe preferable length of the optical imaging lens. When implementingexample embodiments, more details about the convex or concave surfacestructure and/or the refractive power may be incorporated for onespecific lens element or broadly for plural lens elements to enhance thecontrol for the system performance and/or resolution, as illustrated inthe following embodiments. It is noted that the details listed herecould be incorporated in example embodiments if no inconsistency occurs.

Several exemplary embodiments and associated optical data will now beprovided for illustrating example embodiments of optical imaging lenswith good optical characters and shortened lengths. Reference is nowmade to FIGS. 1-5. FIG. 1 illustrates an example cross-sectional view ofan optical imaging lens having five lens elements of the optical imaginglens according to a first example embodiment. FIG. 2 illustrates anotherexample cross-sectional view of a lens element of the optical imaginglens according to an example embodiment. FIG. 3 depicts an example tableof optical data of each lens element of the optical imaging lensaccording to an example embodiment. FIG. 4 depicts an example table ofaspherical data of the optical imaging lens according to an exampleembodiment. FIG. 5 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens according to an example embodiment.

As shown in FIG. 1, the optical imaging lens of the present embodimentcomprises, in order from an object side A1 to an image side A2, anaperture stop 100 positioned at the object side of a first lens element110, the first lens element 110, a second lens element 120, a third lenselement 130, a fourth lens element 140, and a fifth lens element 150.Both of a filtering unit 160 and image plane 170 of an image sensor arepositioned at the image side A2 of the optical imaging lens. The exampleembodiment of filtering unit 160 illustrated is an IR cut filter(infrared cut filter) positioned between the image-side curved surface152 of the fifth lens element 150 and an image plane 170, which filtersout light with specific wavelength from the light passing opticalimaging lens. For example, IR light is filtered out, and this willprohibit the IR light which is not seen by human eyes from producing animage on the image plane 170.

Exemplary embodiments of each lens elements of the optical imaging lenswill now be described with reference to the drawings.

An example embodiment of the first lens element 110 may have positiverefractive power, which may be constructed by plastic material, and maycomprise a convex object-side curved surface 111 and a convex image-sidecurved surface 112. The convex surface 111 and convex surface 112 mayboth be aspherical surfaces.

The second lens element 120 may have negative refractive power, whichmay be constructed by plastic material, and may comprise an object-sidecurved surface 121 having a concave portion 1211 in a vicinity of theoptical axis, a concave portion 1212 neighboring the circumference, anda concave image-side curved surface 122. The curved surface 121 andconcave surface 122 may both be aspherical surfaces in a vicinity of theoptical axis in a vicinity of the optical axis in a vicinity of aperiphery of the fifth lens element 150.

The third lens element 130 may have positive refractive power, which maybe constructed by plastic material, and may comprise an object-sidecurved surface 131 having a convex portion 1311 in a vicinity of theoptical axis, and a concave portion 1312 in a vicinity of a periphery ofthe third lens element 130, and an image-side curved surface 132. Theimage-side curved surface 132 may comprise a concave portion 1321 in avicinity of the optical axis and a convex portion 1322 in a vicinity ofa periphery of the third lens element 130. The curved surface 131, 132may both be aspherical surfaces.

The fourth lens element 140 may have positive refractive power, whichmay be constructed by plastic material, and may comprise a concaveobject-side curved surface 141 and a convex image-side curved surface142. The concave surface 141 and convex surface 142 may both beaspherical surfaces.

The fifth lens element 150 may have negative refractive power, which maybe constructed by plastic material, and may comprise an object-sidecurved surface 151, which may comprise a convex portion 1511 in avicinity of the optical axis and a convex portion 1512 in a vicinity ofa periphery of the fifth lens element 150, and an image-side curvedsurface 152, which may comprise a concave portion 1521 in a vicinity ofthe optical axis and a convex portion 1522 in a vicinity of a peripheryof the fifth lens element 150. The curved surface 151 and the curvedsurface 152 may both be gull wing surfaces of aspherical surfaces.

In example embodiments, air gaps exist between the lens elements, thefiltering unit 160, and the image plane 170 of the image sensor. Forexample, FIG. 1 illustrates the air gaps d1 existing between the firstlens element 110 and the second lens element 120, the air gaps d2existing between the second lens element 120 and the third lens element130, the air gaps d3 existing between the third lens element 130 and thefourth lens element 140, the air gaps d4 existing between the fourthlens element 140 and the fifth lens element 150, the air gaps d5existing between fifth lens element 150 and the filtering unit 160, andthe air gaps d6 existing between the filtering unit 160 and the imageplane 170 of the image sensor. However, in other embodiments, any of theaforesaid air gaps may or may not exist. For example, the profiles ofopposite surfaces of any two adjacent lens elements may correspond toeach other (attached together and therefore form one surface or do notform a surface at all), and in such situation, the air gaps may notexist. The sum of all air gaps d1, d2, d3, d4 between the first andfifth lens elements is denoted by Gaa.

FIG. 3 depicts the optical characters of each lens elements in theoptical imaging lens of the present embodiment, wherein the values ofT2, T3, T2/Gaa and T3/Gaa are:

-   -   T2=0.31000 (mm), satisfying equations (1), (1′);    -   T2/Gaa=0.28999, satisfying equations (2), (2′);    -   T3=0.34207 (mm), satisfying equations (3), (3′);    -   T3/Gaa=0.31999, satisfying equations (4), (4′);

wherein the distance from the object-side curved surface 111 of thefirst lens element 110 to the image-side curved surface 152 of the fifthlens element 150 is 3.75436 (mm), and the length of the optical imaginglens is shortened.

Please note that, in example embodiments, to clearly illustrate thestructure of each lens element, only the part where light passes, i.e.effective part, is shown. For example, taking the first lens element 110as an example, FIG. 1 illustrates the convex object-side curved surface111 and the convex image-side curved surface 112. However, whenimplementing each lens element of the present embodiment, anon-effective part may be formed selectively. Based on the first lenselement 110, please refer to FIG. 2, which illustrates the first lenselement 110 comprising a further non-effective part. Here thenon-effective part is not limited to a protruding part 113 for mountingthe first lens element 110 in the optical imaging lens, and light willnot pass through the protruding part 113.

As illustrated in FIG. 1, the aspherical surfaces, including the convexsurface 111 and the convex surface 112 of the first lens element 110,the curved surface 121 and the concave surface 122 of the second lenselement 120, the curved surfaces 131, 132 of the third lens element 130,the concave surface 141 and the convex surface 142 of the fourth lenselement 140, and the curved surface 151 and the curved surface 152 offifth lens element 150, are all defined by the aspherical formula:

${Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}{a_{2i} \times Y^{2i}}}}$

wherein:

R represents the radius of the surface of the lens element;

Z represents the depth of the aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distance Yfrom the optical axis and the tangent plane of the vertex on the opticalaxis of the aspherical surface);

Y represents the perpendicular distance between the point of theaspherical surface and the optical axis;

K represents a conic constant;

a_(i) represents an aspherical coefficient of i^(th) level;

and the values of each aspherical parameter are represented in FIG. 4.

As illustrated in FIGs (a) through (d), the optical imaging lens ofpresent example embodiments show great characteristics in thelongitudinal spherical aberration (a), astigmatism aberration in thesagittal direction (b), astigmatism aberration in the tangentialdirection (c), and/or distortion aberration (d). Therefore, according toabove illustration, the optical imaging lens of example embodimentsindeed achieve great optical performance and the length of the opticalimaging lens is effectively shortened.

Reference is now made to FIGS. 6-9. FIG. 6 illustrates an examplecross-sectional view of an optical imaging lens having five lenselements of the optical imaging lens according to a second exampleembodiment. FIG. 7 shows an example table of optical data of each lenselement of the optical imaging lens according to the second exampleembodiment. FIG. 8 shows an example table of aspherical data of theoptical imaging lens according to the second example embodiment. FIG. 9(a) shows the longitudinal spherical aberration, FIGS. 9( b) and 9(c)show the respective astigmatic field curves in the sagittal andtangential direction, and FIG. 9( d) shows the distortion of the opticalimaging lens of FIG. 6.

As shown in FIG. 6, the optical imaging lens of the present embodiment,in an order from an object side A1 to an image side A2, comprises anaperture stop 200 positioned at the object side of a first lens element210, the first lens element 210, a second lens element 220, a third lenselement 230, a fourth lens element 240, and a fifth lens element 250.Both of a filtering unit 260 and an image plane 270 of an image sensorare positioned at the image side A2 of the optical imaging lens. In anexample embodiment, filtering unit 260 is an IR cut filter positionedbetween the image-side curved surface 252 of the fifth lens element 250and the image plane 270 to filter out light with specific wavelengthfrom the light passing optical imaging lens. For example, IR light isfiltered out, and this will prohibit the IR light which is not seen byhuman eyes from producing an image on image plane 270.

One difference between the second embodiments and the first embodimentsis that the central thickness of lens T2 of the second lens element 220and the central thickness of lens T3 of the third lens element 230 aredifferent. In this regard, the sum of all air gaps Gaa from the firstlens element 210 to the fifth lens element 250 may be different. Pleaserefer to FIG. 7 for the optical characteristics of each lens elements inthe optical imaging lens of the present embodiment, wherein the valuesof T2, T3, T2/Gaa and T3/Gaa are:

-   -   T2=0.25763 (mm), satisfying equations (1), (1′);    -   T2/Gaa=0.29805, satisfying equations (2), (2′);    -   T3=0.27660 (mm), satisfying equations (3), (3′);    -   T3/Gaa=0.32000, satisfying equations (4), (4′)

wherein the distance from the object side of the first lens element tothe image side of the fifth lens element is 3.68615 (mm) and the lengthof the optical imaging lens is shortened.

Example embodiments of the lens elements of the optical imaging lens maycomprise the following example embodiments:

The first lens element 210 may have positive refractive power, which maybe constructed by plastic material, and may comprise a convexobject-side curved surface 211 and a convex image-side curved surface212. The convex surface 211 and convex surface 212 may both beaspherical surfaces defined by the aspherical formula. Please refer toFIG. 8 for values of the aspherical parameters.

The second lens element 220 may have negative refractive power, whichmay be constructed by plastic material, and may comprise an object-sidecurved surface 221, which has a convex portion 2211 in a vicinity of theoptical axis and a convex portion 2212 in a vicinity of a periphery ofthe second lens element 220, and a concave image-side curved surface222. The curved surface 221 and concave surface 222 may both beaspherical surfaces defined by the aspherical formula. Please refer toFIG. 8 for values of the aspherical parameters.

The third lens element 230 may have negative refractive power, which maybe constructed by plastic material, and may comprise an object-sidecurved surface 231, which has a convex portion 2311 in a vicinity of theoptical axis and a concave portion 2312 in a vicinity of a periphery ofthe third lens element 230, and an image-side curved surface 232, whichhas a concave portion 2321 in a vicinity of the optical axis and aconvex portion 2322 in a vicinity of a periphery of the third lenselement 230. The curved surface 231, 232 may both be aspherical surfacesdefined by the aspherical formula. Please refer to FIG. 8 for values ofthe aspherical parameters.

The fourth lens element 240 may have positive refractive power, whichmay be constructed by plastic material, and may comprise a concaveobject-side curved surface 241 and a convex image-side curved surface242. The concave surface 241 and convex surface 242 may both beaspherical surfaces defined by the aspherical formula. Please refer toFIG. 8 for values of the aspherical parameters.

The fifth lens element 250 may have negative refractive power, which maybe constructed by plastic material, and may comprise an object-sidecurved surface 251, which has a convex portion 2511 in a vicinity of theoptical axis and a convex portion 2512 in a vicinity of a periphery ofthe fifth lens element 250, and an image-side curved surface 252, whichhas a concave portion 2521 in a vicinity of the optical axis and aconvex portion 2522 in a vicinity of a periphery of the fifth lenselement 250. The curved surface 251, 252 may both be gull wing surfacesof the aspherical surfaces defined by the aspherical formula. Pleaserefer to FIG. 8 for values of the aspherical parameters.

In the present embodiment, similar to the first example embodiment, airgaps may exist between the lens elements 210, 220, 230, 240, 250, thefiltering unit 260, and the image plane 270 of the image sensor. Pleaserefer to the positions of the air gaps d1, d2, d3, d4, d5, d6 marked inthe first embodiment, wherein the sum of the air gaps d1, d2, d3, d4 isGaa.

As shown in FIG. 9, the optical imaging lens of the present embodimentshows great characteristics in longitudinal spherical aberration (a),astigmatism in the sagittal direction (b), astigmatism in the tangentialdirection (c), or distortion aberration (d). Therefore, according to theabove illustration, the optical imaging lens of the present embodimentindeed shows great optical performance and the length of the opticalimaging lens is effectively shortened.

Reference is now made to FIGS. 10-13. FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens having five lenselements of the optical imaging lens according to a third exampleembodiment. FIG. 11 depicts an example table of optical data of eachlens element of the optical imaging lens according to the third exampleembodiment. FIG. 12 depicts an example table of aspherical data of theoptical imaging lens according to the third example embodiment. FIG. 13shows example charts of longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe third example embodiment.

As shown in FIG. 10, the optical imaging lens of the present embodiment,in an order from an object side A1 to an image side A2, comprises afirst lens element 310, an aperture stop 300 positioned between thefirst lens element 310 and a second lens element 320, the second lenselement 320, a third lens element 330, a fourth lens element 340, and afifth lens element 350. Both of a filtering unit 360 and an image plane370 of an image sensor may be positioned at the image side A2 of theoptical imaging lens. Here an example embodiment of the filtering unit360 is an IR cut filter positioned between the image-side curved surface352 of the fifth lens element 350 and the image plane 370 to filter outlight with specific wavelength from the light passing optical imaginglens. For example, the IR light is filtered out, and this will prohibitthe IR light which is not seen by human eyes from producing an image onimage plane 370.

Please refer to FIG. 11 for the optical characteristics of each lenselements in the optical imaging lens of the present embodiment, whereinthe values of T2, T3, T2/Gaa and T3/Gaa are:

-   -   T2=0.25285 (mm), satisfying equations (1), (1′);    -   T2/Gaa=0.31316, satisfying equations (2), (2′);    -   T3=0.27452 (mm), satisfying equations (3), (3′);    -   T3/Gaa=0.34000, satisfying equations (4), (4′);

wherein the distance from the object side of the first lens element 310to the image side of the fifth lens element 350 is 3.81589 (mm), and thelength of the optical imaging lens is shortened.

Example embodiments of the lens elements of the optical imaging lens maycomprise the following example embodiments:

The first lens element 310 may have positive refractive power, which maybe constructed by plastic material, and may comprise a convexobject-side curved surface 311 and a concave image-side curved surface312. The convex surface 311 and concave surface 312 may both beaspherical surfaces defined by the aspherical formula. Please refer toFIG. 12 for values of the aspherical parameters.

The aperture stop 300 may be positioned between the first lens element310 and the second lens element 320.

The second lens element 320 may have negative refractive power, whichmay be constructed by plastic material, and may comprise an object-sidecurved surface 321, which has a convex portion 3211 in a vicinity of theoptical axis and a convex portion 3212 in a vicinity of a periphery ofthe second lens element 320, and a concave image-side curved surface322. The curved surface 321 and concave surface 322 may both beaspherical surfaces defined by the aspherical formula. Please refer toFIG. 12 for values of the aspherical parameters.

The third lens element 330 may have positive refractive power, which maybe constructed by plastic material, and may comprise an object-sidecurved surface 331, which has a convex portion 3311 in a vicinity of theoptical axis and a concave portion 3312 in a vicinity of a periphery ofthe third lens element 330, and an image-side curved surface 332, whichhas a concave portion 3321 in a vicinity of the optical axis and aconvex portion 3322 in a vicinity of a periphery of the third lenselement 330. The curved surface 331, 332 may both be aspherical surfacesdefined by the aspherical formula. Please refer to FIG. 12 for values ofthe aspherical parameters.

The fourth lens element 340 may have positive refractive power, whichmay be constructed by plastic material, and may comprise a concaveobject-side curved surface 341 and a convex image-side curved surface342. The concave surface 341 and convex surface 342 may both beaspherical surfaces defined by the aspherical formula. Please refer toFIG. 12 for values of the aspherical parameters.

The fifth lens element 350 may have negative refractive power, which maybe constructed by plastic material, and may comprise an object-sidecurved surface 351, which has a convex portion 3511 in a vicinity of theoptical axis and a convex portion 3512 in a vicinity of a periphery ofthe fifth lens element 350, and an image-side curved surface 352, whichhas a concave portion 3521 in a vicinity of the optical axis and aconvex portion 3522 in a vicinity of a periphery of the fifth lenselement 350. The curved surface 351, 352 may both be gull wing surfacesof aspherical surfaces defined by the aspherical formula. Please referto FIG. 12 for values of the aspherical parameters.

In the present embodiment, for comparison, similar to the firstembodiment, air gaps may exist between the lens elements 310, 320, 330,340, 350, the filtering unit 360, and the image plane 370 of the imagesensor. Please refer to the positions of the air gaps d1, d2, d3, d4,d5, d6 marked in the first embodiment, wherein the sum of the air gapsd1, d2, d3, d4 is Gaa.

One difference between the third embodiment and the first embodiment isthat the central thickness of lens T2 of the second lens element 320 andthe central thickness of lens T3 of the third lens element 330 aredifferent. In this regard, the sum of all air gaps Gaa from the firstlens element 310 to the fifth lens element 350 may be different.Further, the aperture stop 300 of the present embodiment may bepositioned between the first lens element 310 and the second lenselement 320, which may be different from the position of the aperturestop 100 in front of the first lens element 110 in the first embodiment.

As illustrated in FIG. 13, it is clear that the optical imaging lens ofthe present embodiment may achieve great characteristics in longitudinalspherical aberration (a), astigmatism in the sagittal direction (b),astigmatism in the tangential direction (c), or distortion aberration(d). Therefore, according to above illustration, the optical imaginglens of the present embodiment indeed achieve great optical performance,and the length of the optical imaging lens is effectively shortened.

Reference is now made to FIGS. 14-17. FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens having five lenselements of the optical imaging lens according to a fourth exampleembodiment. FIG. 15 shows an example table of optical data of each lenselement of the optical imaging lens according to the fourth exampleembodiment. FIG. 16 shows an example table of aspherical data of theoptical imaging lens according to the fourth example embodiment. FIG. 17shows example charts of longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe fourth example embodiment.

As shown in FIG. 14, the optical imaging lens of the present embodiment,in an order from an object side A1 to an image side A2, comprises anaperture stop 400 positioned at the object side of a first lens element410, the first lens element 410, a second lens element 420, a third lenselement 430, a fourth lens element 440, and a fifth lens element 450.Both of a filtering unit 460 and an image plane 470 of an image sensormay be positioned at the image side A2 of the optical imaging lens. Herean example embodiment of filtering unit 460 is an IR cut filter, whichmay be positioned between the image-side curved surface 452 of the fifthlens element 450 and the image plane 470 to filter out light withspecific wavelength from the light passing optical imaging lens. Forexample, IR light may be filtered out, and this will prohibit the IRlight which is not seen by human eyes from producing an image on imageplane 470.

Please refer to FIG. 15 for the optical characteristics of each lenselements in the optical imaging lens of the present embodiment, whereinThe values of T2, T3, T2/Gaa and T3/Gaa are:

-   -   T2=0.45000 (mm), satisfying equations (1), (1′);    -   T2/Gaa=0.39001, satisfying equations (2), (2′);    -   T3=0.36920 (mm), satisfying equations (3), (3′);    -   T3/Gaa=0.31998, satisfying equations (4), (4′);

wherein the distance from the object side of the first lens element tothe image side of the fifth lens element is 3.71940 (mm), and the lengthof the optical imaging lens is shortened.

Example embodiments of the lens elements of the optical imaging lens maycomprise the following example embodiments:

The first lens element 410 may have positive refractive power, which maybe constructed by plastic material, and may comprise a convexobject-side curved surface 411 and a concave image-side curved surface412. The convex surface 411 and the concave surface 412 may both beaspherical surfaces defined by the aspherical formula. Please refer toFIG. 16 for values of the aspherical parameters.

The second lens element 420 may have negative refractive power, whichmay be constructed by plastic material, and may comprise an object-sidecurved surface 421, which has a convex portion 4211 in a vicinity of theoptical axis and a concave portion 4212 in a vicinity of a periphery ofthe second lens element 420, and a concave image-side curved surface422. The curved surface 421 and concave surface 422 may both beaspherical surfaces defined by the aspherical formula. Please refer toFIG. 16 for values of the aspherical parameters.

The third lens element 430 may have positive refractive power, which maybe constructed by plastic material, and may comprise an object-sidecurved surface 431, which has a convex portion 4311 in a vicinity of theoptical axis and a concave portion 4312 in a vicinity of a periphery ofthe third lens element 430, and an image-side curved surface 432, whichhas a concave portion 4321 in a vicinity of the optical axis and aconvex portion 4322 in a vicinity of a periphery of the third lenselement 430. The curved surface 431, 432 may both be aspherical surfacesdefined by the aspherical formula. Please refer to FIG. 16 for values ofthe aspherical parameters.

The fourth lens element 440 may have positive refractive power, whichmay be constructed by plastic material, and may comprise a concaveobject-side curved surface 441 and a convex image-side curved surface442. The concave surface 441 and convex surface 442 may both beaspherical surfaces defined by the aspherical formula. Please refer toFIG. 16 for values of the aspherical parameters.

The fifth lens element 450 may have negative refractive power, which maybe constructed by plastic material, and may comprise an object-sidecurved surface 451, which has a convex portion 4511 in a vicinity of theoptical axis and a convex portion 4512 in a vicinity of a periphery ofthe fifth lens element 450, and an image-side curved surface 452, whichhas a concave portion 4521 in a vicinity of the optical axis and aconvex portion 4522 in a vicinity of a periphery of the fifth lenselement 450. The curved surface 451, 452 may both be gull wing surfacesof aspherical surfaces defined by the aspherical formula. Please referto FIG. 16 for values of the aspherical parameters.

In the present embodiment, for comparison, similar to the firstembodiment, air gaps may exist between the lens elements 410, 420, 430,440, 450, the filtering unit 460, and the image plane 470 of the imagesensor. Please refer to the positions of the air gaps d1, d2, d3, d4,d5, d6 marked in the first embodiment, wherein the sum of the air gapsd1, d2, d3, d4 is Gaa.

One difference between the fourth embodiment and the first embodiment isthat the central thickness of lens T2 of the second lens element 420 andthe central thickness of lens T3 of the third lens element 430 may bedifferent. In this regard, the sum of all air gaps Gaa from the firstlens element 410 to the fifth lens element 450 may be different.

As illustrated in FIG. 17, it is clear that the optical imaging lens ofthe present embodiment may achieve great characteristics in longitudinalspherical aberration (a), astigmatism in the sagittal direction (b),astigmatism in the tangential direction (c), or distortion aberration(d). Therefore, according to above illustration, the optical imaginglens of the present embodiment indeed achieves great opticalperformance, and the length of the optical imaging lens is effectivelyshortened.

Reference is now made to FIGS. 18-21. FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens having five lenselements of the optical imaging lens according to a fifth embodiment.FIG. 19 shows an example table of optical data of each lens element ofthe optical imaging lens according to the fifth example embodiment. FIG.20 shows an example table of aspherical data of the optical imaging lensaccording to the fifth example embodiment. FIG. 21 shows example chartsof longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens according to the fifth exampleembodiment.

As shown in FIG. 18, the optical imaging lens of the present embodiment,in an order from an object side A1 to an image side A2, comprises anaperture stop 500 positioned between the object side and a first lenselement 510, the first lens element 510, a second lens element 520, athird lens element 530, a fourth lens element 540, and a fifth lenselement 550. Both of a filtering unit 560 and an image plane 570 of animage sensor may be positioned at the image side A2 of the opticalimaging lens. Here an example embodiment of filtering unit 560 is an IRcut filter, which may be positioned between the image-side curvedsurface 552 of the fifth lens element 550 and the image plane 570 tofilter out light with specific wavelength from the light passing opticalimaging lens. For example, IR light may be filtered out, and this willprohibit the IR light which is not seen by human eyes from producing animage on image plane 570.

Please refer to FIG. 19 for the optical characteristics of each lenselements in the optical imaging lens of the present embodiment, whereinThe values of T2, T3, T2/Gaa and T3/Gaa are:

-   -   T2=0.29660 (mm), satisfying equations (1), (1′);    -   T2/Gaa=0.29001, satisfying equations (2), (2′);    -   T3=0.45000 (mm), satisfying equations (3), (3′);    -   T3/Gaa=0.44001, satisfying equations (4), (4′);

wherein the distance from the object side of the first lens element tothe image side of the fifth lens element is 3.70690 (mm), and the lengthof the optical imaging lens is shortened.

Example embodiments of the lens elements of the optical imaging lens maycomprise the following example embodiments:

The first lens element 510 may have positive refractive power, which maybe constructed by plastic material, and may comprise a convexobject-side curved surface 511 and a concave image-side curved surface512. The convex surface 511 and concave surface 512 may both beaspherical surfaces defined by the aspherical formula. Please refer toFIG. 20 for values of the aspherical parameters.

The second lens element 520 may have negative refractive power, whichmay be constructed by plastic material, and may comprise an object-sidecurved surface 521, which has a convex portion 5211 in a vicinity of theoptical axis and a convex portion 5212 in a vicinity of a periphery ofthe second lens element 520, and a concave image-side curved surface522. The curved surface 521 and concave surface 522 may both beaspherical surfaces defined by the aspherical formula. Please refer toFIG. 20 for values of the aspherical parameters.

The third lens element 530 may have positive refractive power, which maybe constructed by plastic material, and may comprise an object-sidecurved surface 531, which has a concave portion 5311 in a vicinity ofthe optical axis and a concave portion 5312 in a vicinity of a peripheryof the third lens element 530, and an image-side curved surface 532,which has a convex portion 5321 in a vicinity of the optical axis and aconvex portion 5322 in a vicinity of a periphery of the third lenselement 530. The curved surface 531, 532 may both be aspherical surfacesdefined by the aspherical formula. Please refer to FIG. 20 for values ofthe aspherical parameters.

The fourth lens element 540 may have positive refractive power, whichmay be constructed by plastic material, and may comprise a concaveobject-side curved surface 541 and a convex image-side curved surface542. The concave surface 541 and convex surface 542 may both beaspherical surfaces defined by the aspherical formula. Please refer toFIG. 20 for values of the aspherical parameters.

The fifth lens element 550 may have negative refractive power, which maybe constructed by plastic material, and may comprise an object-sidecurved surface 551, which has a convex portion 5511 in a vicinity of theoptical axis and a convex portion 5512 in a vicinity of a periphery ofthe fifth lens element 550, and an image-side curved surface 552, whichhas a concave portion 5521 in a vicinity of the optical axis and aconvex portion 5522 in a vicinity of a periphery of the fifth lenselement 550. The curved surfaces 551, 552 may both be gull wing surfacesof aspherical surfaces defined by the aspherical formula. Please referto FIG. 20 for values of the aspherical parameters.

In the present embodiment, for comparison, similar to the firstembodiment, air gaps may exist between the lens elements 510, 520, 530,540, 550, the filtering unit 560, and the image plane 570 of the imagesensor. Please refer to the positions of the air gaps d1, d2, d3, d4,d5, d6 marked in the first embodiment, wherein the sum of the air gapsd1, d2, d3, d4 is Gaa.

One difference between the fifth embodiment and the first embodiment isthat the central thickness of lens T2 of the second lens element 520 andthe central thickness of lens T3 of the third lens element 530 may bedifferent. Therefore, the sum of all air gaps Gaa from the first lenselement 510 to the fifth lens element 550 may be different.

As illustrated in FIG. 21, it is clear that the optical imaging lens ofthe present embodiment may show great characteristics in longitudinalspherical aberration (a), astigmatism in the sagittal direction (b),astigmatism in the tangential direction (c), or distortion aberration(d). Therefore, according to above illustration, the optical imaginglens of the present embodiment indeed achieves great opticalperformance, and the length of the optical imaging lens is effectivelyshortened.

Reference is now made to FIGS. 22-25. FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens having five lenselements of the optical imaging lens according to a sixth exampleembodiment. FIG. 23 shows an example table of optical data of each lenselement of the optical imaging lens according to the sixth exampleembodiment. FIG. 24 shows an example table of aspherical data of theoptical imaging lens according to the sixth example embodiment. FIG. 25(a) shows the longitudinal spherical aberration, FIGS. 25( b) and 25(c)show the respective astigmatic field curves in the sagittal andtangential direction, and FIG. 25( d) shows the distortion according tothe sixth example embodiment.

As shown in FIG. 22, the optical imaging lens of the present embodiment,in an order from an object side A1 to an image side A2, comprises anaperture stop 600 positioned between the object side and a first lenselement 610, the first lens element 610, a second lens element 620, athird lens element 630, a fourth lens element 640, and a fifth lenselement 650. Both of a filtering unit 660 and an image plane 670 of animage sensor may be positioned at the image side A2 of the opticalimaging lens. Here an example embodiment of filtering unit 660 may be anIR cut filter, which may be positioned between the image-side curvedsurface 652 of the fifth lens element 650 and the image plane 670 tofilter out light with specific wavelength from the light passing opticalimaging lens. For example, IR light may be filtered out, and this mayprohibit the IR light which is not seen by human eyes from producing animage on image plane 670.

Please refer to FIG. 23 for the optical characteristics of each lenselements in the optical imaging lens of the present embodiment, whereinThe values of T2, T3, T2/Gaa and T3/Gaa are:

-   -   T2=0.36250 (mm), satisfying equations (1), (1′);    -   T2/Gaa=0.29000, satisfying equations (2), (2′);    -   T3=0.55000 (mm), satisfying equations (3), (3′);    -   T3/Gaa=0.44000, satisfying equations (4), (4′);

wherein the distance from the object side of the first lens element tothe image side of the fifth lens element is 3.84120 (mm), and the lengthof the optical imaging lens is shortened.

Example embodiments of the lens elements of the optical imaging lens maycomprise the following example embodiments:

The first lens element 610 may have positive refractive power, which maybe constructed by plastic material, and may comprise a convexobject-side curved surface 611 and a concave image-side curved surface612. The convex surface 611 and 612 may both be aspherical surfacesdefined by the aspherical formula. Please refer to FIG. 24 for values ofthe aspherical parameters.

The second lens element 620 may have negative refractive power, whichmay be constructed by plastic material, and may be an object-side curvedsurface 621, which has a convex portion 6211 in a vicinity of theoptical axis and a convex portion 6212 in a vicinity of a periphery ofthe second lens element 620, and a concave image-side curved surface622. The curved surface 621 and concave surface 622 may both beaspherical surfaces defined by the aspherical formula. Please refer toFIG. 24 for values of the aspherical parameters.

The third lens element 630 may have negative refractive power, which maybe constructed by plastic material, and may comprise an object-sidecurved surface 631, which has a concave portion 6311 in a vicinity ofthe optical axis and a concave portion 6312 in a vicinity of a peripheryof the third lens element 630, and an image-side curved surface 632,which has a concave portion 6321 in a vicinity of the optical axis and aconvex portion 6322 in a vicinity of a periphery of the third lenselement 630. The curved surface 631, 632 may both be aspherical surfacesdefined by the aspherical formula. Please refer to FIG. 24 for values ofthe aspherical parameters.

The fourth lens element 640 may have positive refractive power, whichmay be constructed by plastic material, and may comprise a concaveobject-side curved surface 641 and a convex image-side curved surface642. The concave surface 641 and convex surface 642 may both beaspherical surfaces defined by the aspherical formula. Please refer toFIG. 24 for values of the aspherical parameters.

The fifth lens element 650 may have negative refractive power, which maybe constructed by plastic material, and may comprise an object-sidecurved surface 651, which has a convex portion 6511 in a vicinity of theoptical axis and a convex portion 6512 in a vicinity of a periphery ofthe fifth lens element 650, and an image-side curved surface 652, whichhas a concave portion 6521 in a vicinity of the optical axis and aconvex portion 6522 in a vicinity of a periphery of the fifth lenselement 650. The curved surface 651, 652 may both be gull wing surfacesof aspherical surfaces defined by the aspherical formula. Please referto FIG. 24 for values of the aspherical parameters.

In the present embodiment, for comparison, similar to the firstembodiment, air gaps may exist between the lens elements 610, 620, 630,640, 650, the filtering unit 660, and the image plane 670 of the imagesensor. Please refer to the positions of the air gaps d1, d2, d3, d4,d5, d6 marked in the first embodiment, wherein the sum of the air gapsd1, d2, d3, d4 is Gaa.

One difference between the sixth embodiment and the first embodiment isthat the central thickness of lens T2 of the second lens element 620 andthe central thickness of lens T3 of the third lens element 630 may bedifferent. In this regard, the sum of all air gaps Gaa from the firstlens element 610 to the fifth lens element 650 may be different.

As illustrated in FIG. 25, it is clear that the optical imaging lens ofthe present embodiment may show great characteristics in longitudinalspherical aberration (a), astigmatism in the sagittal direction (b),astigmatism in the tangential direction (c), or distortion aberration(d). Therefore, according to above illustration, the optical imaginglens of the present embodiment indeed achieves great opticalperformance, and the length of the optical imaging lens is effectivelyshortened.

Reference is now made to FIGS. 26-29. FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens having five lenselements of the optical imaging lens according to a seventh exampleembodiment. FIG. 27 shows an example table of optical data of each lenselement of the optical imaging lens according to the seventh exampleembodiment. FIG. 28 shows an example table of aspherical data of theoptical imaging lens according to the seventh example embodiment. FIG.29 shows example charts of longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe seventh example embodiment.

As shown in FIG. 26, the optical imaging lens of the present embodiment,in an order from an object side A1 to an image side A2, comprises anaperture stop 700 positioned between the object side and a first lenselement 710, the first lens element 710, a second lens element 720, athird lens element 730, a fourth lens element 740, and a fifth lenselement 750. Both of a filtering unit 760 and an image plane 770 of animage sensor may be positioned at the image side A2 of the opticalimaging lens. Here an example embodiment of filtering unit 760 maycomprise an IR cut filter, which is positioned between the image-sidecurved surface 752 of the fifth lens element 750 and the image plane 770to filter out light with specific wavelength from the light passingoptical imaging lens. For example, IR light is filtered out, and thismay prohibit the IR light which is not seen by human eyes from producingan image on image plane 770.

Please refer to FIG. 27 for the optical characteristics of each lenselements in the optical imaging lens of the present embodiment, whereinThe values of T2, T3, T2/Gaa and T3/Gaa are:

-   -   T2=0.21999 (mm), satisfying equations (1), (1′);    -   T2/Gaa=0.28974, satisfying equations (2), (2′);    -   T3=0.26816 (mm), satisfying equations (3), (3′);    -   T3/Gaa=0.35319, satisfying equations (4), (4′);

wherein the distance from the object side of the first lens element tothe image side of the fifth lens element is 3.59439 (mm), and the lengthof the optical imaging lens is shortened.

Example embodiments of the lens elements of the optical imaging lens maycomprise the following example embodiments:

The first lens element 710 may have positive refractive power, which maybe constructed by plastic material, and may comprise a convexobject-side curved surface 711 and a concave image-side curved surface712. The surfaces 711 and 712 may both be aspherical surfaces defined bythe aspherical formula. Please refer to FIG. 28 for values of theaspherical parameters.

The second lens element 720 may have negative refractive power, whichmay be constructed by plastic material, and may comprise an object-sidecurved surface 721, which has a convex portion 7211 in a vicinity of theoptical axis and a convex portion 7212 in a vicinity of a periphery ofthe second lens element 720, and a concave image-side curved surface722. The curved surface 721 and concave surface 722 may both beaspherical surfaces defined by the aspherical formula. Please refer toFIG. 28 for values of the aspherical parameters.

The third lens element 730 may have negative refractive power, which maybe constructed by plastic material, and may comprise an object-sidecurved surface 731, which has a concave portion 7311 in a vicinity ofthe optical axis and a concave portion 7312 in a vicinity of a peripheryof the third lens element 730, and an image-side curved surface 732,which has a convex portion 7321 in a vicinity of the optical axis and aconvex portion 7322 in a vicinity of a periphery of the third lenselement 730. The curved surfaces 731, 732 may both be asphericalsurfaces defined by the aspherical formula. Please refer to FIG. 28 forvalues of the aspherical parameters.

The fourth lens element 740 may have positive refractive power, whichmay be constructed by plastic material, and may comprise a concaveobject-side curved surface 741 and a convex image-side curved surface742. The concave surface 741 and convex surface 742 may both beaspherical surfaces defined by the aspherical formula. Please refer toFIG. 28 for values of the aspherical parameters.

The fifth lens element 750 may have negative refractive power, which maybe constructed by plastic material, and may comprise an object-sidecurved surface 751, which has a convex portion 7511 in a vicinity of theoptical axis and a convex portion 7512 in a vicinity of a periphery ofthe fifth lens element 750, and an image-side curved surface 752, whichhas a concave portion 7521 in a vicinity of the optical axis and aconvex portion 7522 in a vicinity of a periphery of the fifth lenselement 750. The curved surfaces 751, 752 may both be gull wing surfacesof aspherical surfaces defined by the aspherical formula. Please referto FIG. 28 for values of the aspherical parameters.

In the present embodiment, for comparison, similar to the firstembodiment, air gaps may exist between the lens elements 710, 720, 730,740, 750, the filtering unit 760, and the image plane 770 of the imagesensor. Please refer to the positions of the air gaps d1, d2, d3, d4,d5, d6 marked in the first embodiment, wherein the sum of the air gapsd1, d2, d3, d4 is Gaa.

One difference between the seventh embodiment and the first embodimentis the central thickness of lens T2 of the second lens element 720 andthe central thickness of lens T3 of the third lens element 730 may bedifferent. In this regard, the sum of all air gaps Gaa from the firstlens element 710 to the fifth lens element 750 may be different.

As illustrated in FIG. 29, it is clear that the optical imaging lens ofthe present embodiment may show great characteristics in longitudinalspherical aberration (a), astigmatism in the sagittal direction (b),astigmatism in the tangential direction (c), or distortion aberration(d). Therefore, according to above illustration, the optical imaginglens of the present embodiment indeed achieves great opticalperformance, and the length of the optical imaging lens is effectivelyshortened.

Please refer to FIG. 30, which shows the values of T2, T3, T2/Gaa andT3/Gaa of all seven embodiments. As shown, this table provides a clearillustration that the optical imaging lens of example embodiments indeedsatisfies the equations (1), (2), (3), (4), (1′), (2′), (3′), and (4′).

Reference is now made to FIGS. 31-32. FIG. 31 illustrates an examplestructural view of an example embodiment of mobile device 1. FIG. 32shows an example enlarged view of the example embodiment of mobiledevice 1 of FIG. 31. An example of the mobile device 1 may be a mobilephone, but the type of the mobile device 1 should not be limited tosuch. As shown, the mobile device 1 may comprise a housing 10 and anoptical imaging lens assembly 20 positioned in the housing 10. Thehousing 10 protects the optical imaging lens assembly 20 therein, and isnot limited to any shape or material. The optical imaging lens assembly20 may comprise a lens barrel 21, an optical imaging lens 22, a modulehousing unit 23, and an image sensor 171 which is positioned at an imageside of the optical imaging lens 22. In example embodiments, any opticalimaging lens may be used as the optical imaging lens 22, such as anyoptical imaging lens disclosed in the aforesaid embodiments or otheroptical imaging lens according to example embodiments. However, forclearly illustrating the present embodiment, the optical imaging lens ofthe first embodiment will be used as the optical imaging lens 22. Whenusing other optical imaging lens 22, the structure of the filtering unit160 may be omitted. Furthermore, the housing 10, the lens barrel 21,and/or the module housing unit 23 may be integrated into a singlecomponent or assembled by multiple components. Furthermore, the imagesensor 171 used in the present embodiment is directly attached on thesubstrate 172 in the form of a chip on board (COB) package, and suchpackage is different from traditional chip scale packages (CSP) since itdoes not require a cover glass. That is, no cover glass is requiredbefore the image sensor 171 in the optical imaging lens 22. It should benoted, however, that example embodiments are not limited to this packagetype. The optical imaging lens with refractive power as a wholecomprises five lens elements 110, 120, 130, 140, 150 positioned in thelens barrel 21, wherein an air gap may exist between any two adjacentlens elements. The module housing unit 23 is provided for positioningthe optical imaging lens 22 thereon, and preferably comprises an imagesensor base 233 and an auto focus module 234. The image sensor base 233may be fixed on the substrate 172, and the auto focus module 234 maycomprise a lens seat 2341 for positioning the optical imaging lens 22.The lens seat 2341 may be capable of moving back and forth along theoptical axis to control the focusing of the optical imaging lens 22. Forexample, according to the distance of the object, the optical imaginglens 22 may be moved back and forth until the image focuses on the imageplane 170 of the image sensor 171. Because the length of the opticalimaging lens 22 is merely 3.75436 (mm), the size of the mobile device 1may be quite small with good optical characters. Therefore, the presentembodiment meets the demand of smaller sized product design and therequest of the market.

Reference is now made to FIG. 33, which shows a structural view of anexample embodiment of mobile device 2. Here the housing is not shown,and only the optical imaging lens assembly 20 is shown. As shown, onedifference between the mobile device 2 and the mobile device 1 may bethe structure of the module housing unit 24. The module housing unit 24may comprise an image sensor base 243 and an auto focus module 244,which may comprise a voice coil motor (VCM) comprising a lens seat 2441,a magnet 2442 and a coil 2443. With the magnetic force produced by themagnet 2442 and the coil 2443, the VCM may move the lens seat 2441slightly to move the lens seat 2441 back and forth along an optical axisto focus the optical imaging lens 22. Because the length of the opticalimaging lens 22 may be shortened, the mobile device 2 may be designedwith a smaller size and meanwhile good optical performance is stillprovided. Therefore, the present embodiment meets the demand of smallsized product design and the request of the market.

According to above illustration, it is clear that the mobile device andthe optical imaging lens thereof in example embodiments, throughcontrolling ratio of at least one central thickness of lens to a sum ofall air gaps along the optical axis between five lens elements in apredetermined range, and incorporated with detail structure and/orreflection power of the lens elements, the lengths of the opticalimaging lens is effectively shortened and meanwhile good opticalcharacters are still provided.

While various embodiments in accordance with the disclosed principleshave been described above, it should be understood that they have beenpresented by way of example only, and are not limiting. Thus, thebreadth and scope of exemplary embodiment(s) should not be limited byany of the above-described embodiments, but should be defined only inaccordance with the claims and their equivalents issuing from thisdisclosure. Furthermore, the above advantages and features are providedin described embodiments, but shall not limit the application of suchissued claims to processes and structures accomplishing any or all ofthe above advantages.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens comprising, from anobject side to an image side: an aperture stop; a first lens element; asecond lens element; a third lens element; a fourth lens element; and afifth lens element, each of the first, second, third, fourth, and fifthlens element having an object-side surface facing toward the object sideand an image-side surface facing toward the image side, wherein: theimage-side surface of the first lens element has a concave portion in avicinity of an optical axis; the object-side surface of the second lenselement has a convex portion in a vicinity of an optical axis, and theimage-side surface of the second lens element has a concave portion in avicinity of a periphery; the object-side surface of the fourth lenselement has a concave portion in a vicinity of the optical axis, and theimage-side surface of the fourth lens element has a convex portion in avicinity of the optical axis; the object-side surface of the fifth lenselement has a convex portion in a vicinity of the optical axis, and theimage-side surface of the fifth lens element has a concave portion in avicinity of the optical axis; the optical imaging lens has only fivelens elements having a refracting power; and the optical imaging lenssatisfies the following relations:7.508≦ALT/AG34≦13.850;3.934≦AAG/AG23≦6.028; and2.570≦T5/AG12≦4.340, wherein ALT is a sum of thicknesses of the first tofifth lens elements, AG34 is a width of an air gap between the third andfourth lens elements along the optical axis, AAG is a sum of widths ofair gaps between the first to fifth lens elements, AG23 is a width of anair gap between the second and third lens elements along the opticalaxis, T5 is a thickness of the fifth lens element along the opticalaxis, and AG12 is a width of an air gap between the first and secondlens elements along the optical axis.
 2. The optical imaging lens ofclaim 1 wherein a ratio TTL/T1 is between 8.087 and 10.394, wherein TTLis a distance at the optical axis between the object-side surface of thefirst lens element and an image plane at the image side and T1 is athickness of the first lens element along the optical axis.
 3. Theoptical imaging lens of claim 1 wherein a ratio ALT/T3 is between 3.525and 7.172, wherein T3 is a thickness of the third lens element along theoptical axis.
 4. The optical imaging lens of claim 1 wherein a ratioAAG/AG45 is between 2.324 and 11.920, wherein AG45 is a width of an airgap between the fourth and fifth lens elements along the optical axis.5. The optical imaging lens of claim 1 wherein a ratio T3/T1 is between0.555 and 1.418, wherein T3 is a thickness of the third lens elementalong the optical axis and T1 is a thickness of the first lens elementalong the optical axis.
 6. The optical imaging lens of claim 1 wherein aratio T4/T2 is between 0.949 and 2.350, wherein T4 is a thickness of thefourth lens element along the optical axis and T2 is a thickness of thesecond lens element along the optical axis.
 7. The optical imaging lensof claim 1 wherein a ratio T3/AG34 is between 1.047 and 3.929, whereinT3 is a thickness of the third lens element along the optical axis. 8.An optical imaging lens comprising, from an object side to an imageside: an aperture stop; a first lens element; a second lens element; athird lens element; a fourth lens element; and a fifth lens element,each of the first, second, third, fourth, and fifth lens elements havingan object-side surface facing toward the object side and an image-sidesurface facing toward the image side, wherein: the image-side surface ofthe first lens element has a concave portion in a vicinity of an opticalaxis; the object-side surface of the second lens element has a convexportion in a vicinity of the optical axis, and the image-side surface ofthe second lens element has a concave portion in a vicinity of aperiphery; the object-side surface of the fourth lens element has aconcave portion in a vicinity of the optical axis, and the image-sidesurface of the fourth lens element has a convex portion in a vicinity ofthe optical axis; the object-side surface of the fifth lens element hasa convex portion in a vicinity of the optical axis, and the image-sidesurface of the fifth lens element has a concave portion in a vicinity ofthe optical axis; the optical imaging lens has only five lens elementshaving a refracting power; and the optical imaging lens satisfies thefollowing relations:7.508≦ALT/AG34≦13.850;0.726≦T2/AG23≦1.590; and2.570≦T5/AG12≦4.340, wherein ALT is a sum of thicknesses of the first tofifth lens elements, AG34 is a width of an air gap between the third andfourth lens elements along the optical axis, T2 is a thickness of thesecond lens element along the optical axis, AG23 is a width of an airgap between the second and third lens elements along the optical axis,T5 is a thickness of the fifth lens element along the optical axis, andAG12 is a width of an air gap between the first and second lens elementsalong the optical axis.
 9. The optical imaging lens of claim 8 wherein aratio AG23/AG45 is between 0.385 and 3.030, wherein AG45 is a width ofan air gap between the fourth and fifth lens elements along the opticalaxis.
 10. The optical imaging lens of claim 8 wherein a ratio T4/T2 isbetween 0.949 and 2.350, wherein T4 is a thickness of the fourth lenselement along the optical axis.
 11. The optical imaging lens of claim 8wherein a ratio TTL/T3 is between 7.333 and 14.575, wherein TTL is adistance at the optical axis between the object-side surface of thefirst lens element and an image plane at the image side and T3 is athickness of the third lens element along the optical axis.
 12. Theoptical imaging lens of claim 8 wherein a ratio AAG/AG45 is between2.324 and 11.920, wherein AAG is a sum of widths of air gaps between thefirst to fifth lens elements and AG45 is a width of an air gap betweenthe fourth and fifth lens elements along the optical axis.
 13. Theoptical imaging lens of claim 8 wherein a ratio T4/AG45 is between 0.512and 5.170, wherein T4 is a thickness of the fourth lens element alongthe optical axis and AG45 is a width of an air gap between the fourthand fifth lens elements along the optical axis.
 14. The optical imaginglens of claim 8 wherein a ratio T1/T3 is between 0.705 and 1.802,wherein T1 is a thickness of the first lens element along the opticalaxis and T3 is a thickness of the third lens element along the opticalaxis.
 15. An optical imaging lens comprising, from an object side to animage side: an aperture stop; a first lens element; a second lenselement; a third lens element; a fourth lens element; and a fifth lenselement, each of the first, second, third, fourth, and fifth lenselements having an object-side surface facing toward the object side andan image-side surface facing toward the image side, wherein: theimage-side surface of the first lens element has a concave portion in avicinity of an optical axis; the object-side surface of the second lenselement has a convex portion in a vicinity of the optical axis, and theimage-side surface of the second lens element has a concave portion in avicinity of a periphery; the object-side surface of the fourth lenselement has a concave portion in a vicinity of the optical axis, and theimage-side surface of the fourth lens element has a convex portion in avicinity of the optical axis; the object-side surface of the fifth lenselement has a convex portion in a vicinity of the optical axis, and theimage-side surface of the fifth lens element has a concave portion in avicinity of the optical axis; the optical imaging lens has only fivelens elements having a refracting power; and the optical imaging lenssatisfies the following relations:7.508≦ALT/AG34≦13.850;2.306≦AAG/T4≦4.542; and2.570≦T5/AG12≦4.340, wherein ALT is a sum of thicknesses of the first tofifth lens elements, AG34 is a width of an air gap between the third andfourth lens elements along the optical axis, AAG is a sum of widths ofair gaps between the first to fifth lens elements, T4 is a thickness ofthe fourth lens element along the optical axis, T5 is a thickness of thefifth lens element along the optical axis, and AG12 is a width of an airgap between the first and second lens elements along the optical axis.16. The optical imaging lens of claim 15 wherein a ratio AAG/AG45 isbetween 2.324 and 11.920, wherein AG45 is a width of an air gap betweenthe fourth and fifth lens elements along the optical axis.
 17. Theoptical imaging lens of claim 16 wherein a ratio TTL/T1 is between 8.087and 10.394, wherein TTL is a distance at the optical axis between theobject-side surface of the first lens element and an image plane at theimage side and T1 is a thickness of the first lens element along theoptical axis.
 18. The optical imaging lens of claim 17 wherein a ratioATL/T3 is between 3.525 and 7.172, wherein T3 is a thickness of thethird lens element along the optical axis.
 19. The optical imaging lensof claim 18 wherein a ratio T2/AG23 is between 0.726 and 1.590, whereinT2 is a thickness of the second lens element along the optical axis andAG23 is a width of an air gap between the second and third lens elementsalong the optical axis.
 20. The optical imaging lens of claim 19 whereina ratio AAG/AG23 is between 3.934 and 6.028.